Molecular dynamics simulations of α-alumina and γ-alumina surfaces
1993; Elsevier BV; Volume: 295; Issue: 1-2 Linguagem: Inglês
10.1016/0039-6028(93)90202-u
ISSN1879-2758
AutoresSławomir Błoński, Stephen H. Garofalini,
Tópico(s)Chemical and Physical Properties of Materials
ResumoMolecular dynamics simulations of crystalline aluminum oxide were performed for α-Al2O3 and γ-Al2O3 phases. Both bulk crystals and surfaces of each phase were studied. For each of the surfaces, several possible atomic terminations were examined and surface energies, density profiles, and atom configurations have been calculated. It was found that due to processes of surface relaxation and reconstruction some terminations of the α-alumina surfaces become more likely to appear. For γ-alumina, the occurrence of cation vacancies in the crystal structure has a significant influence on surface morphology. On the surfaces, additional active sites were observed which are not predicted by idealized models which omit vacancies.
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